Anderson localization transition in a robust $\mathcal{P}\mathcal{T}$-symmetric phase of a generalized Aubry-Andre model

Abstract

We study a generalized Aubry-Andre model that obeys $\mathcal{P}\mathcal{T}$-symmetry. We observe a robust $\mathcal{P}\mathcal{T}$-symmetric phase with respect to system size and disorder strength, where all eigenvalues are real despite the Hamiltonian being non-hermitian. This robust $\mathcal{P}\mathcal{T}$-symmetric phase can support an Anderson localization transition, giving a rich phase diagram as a result of the interplay between disorder and $\mathcal{P}\mathcal{T}$-symmetry. Our model provides a perfect platform to study disorder-driven localization phenomena in a $\mathcal{P}\mathcal{T}$-symmetric system.

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